| #ifndef BLK_IOPOLL_H |
| #define BLK_IOPOLL_H |
| |
| struct blk_iopoll; |
| typedef int (blk_iopoll_fn)(struct blk_iopoll *, int); |
| |
| struct blk_iopoll { |
| struct list_head list; |
| unsigned long state; |
| unsigned long data; |
| int weight; |
| int max; |
| blk_iopoll_fn *poll; |
| }; |
| |
| enum { |
| IOPOLL_F_SCHED = 0, |
| IOPOLL_F_DISABLE = 1, |
| }; |
| |
| /* |
| * Returns 0 if we successfully set the IOPOLL_F_SCHED bit, indicating |
| * that we were the first to acquire this iop for scheduling. If this iop |
| * is currently disabled, return "failure". |
| */ |
| static inline int blk_iopoll_sched_prep(struct blk_iopoll *iop) |
| { |
| if (!test_bit(IOPOLL_F_DISABLE, &iop->state)) |
| return test_and_set_bit(IOPOLL_F_SCHED, &iop->state); |
| |
| return 1; |
| } |
| |
| static inline int blk_iopoll_disable_pending(struct blk_iopoll *iop) |
| { |
| return test_bit(IOPOLL_F_DISABLE, &iop->state); |
| } |
| |
| extern void blk_iopoll_sched(struct blk_iopoll *); |
| extern void blk_iopoll_init(struct blk_iopoll *, int, blk_iopoll_fn *); |
| extern void blk_iopoll_complete(struct blk_iopoll *); |
| extern void __blk_iopoll_complete(struct blk_iopoll *); |
| extern void blk_iopoll_enable(struct blk_iopoll *); |
| extern void blk_iopoll_disable(struct blk_iopoll *); |
| |
| extern int blk_iopoll_enabled; |
| |
| #endif |